Metrobility T3/E3 twister

Metrobility T3/E3 twister T3-BWDM twister 2115 T3-TX RX TX E3-BWDM twister 2175 E3-TX RX TX LBK LBK PWR LBK LBK PWR T3-FX MM twister 2115 T3-TX RX TX E3-FX MM twister 2175 E3-TX RX TX TX RX LBK LBK PWR TX RX LBK LBK PWR T3-FX SM twister 2115 T3-TX RX TX E3-FX SM twister 2175 E3-TX RX TX TX RX LBK LBK PWR TX RX LBK LBK PWR Installation & User Guide Models: 2115-23-01 / 2115-24-01 / 2115-25-01 / 2115-26-01 / 2115-27-01 / 2115-2J-01 / 2115-2X-01 / 2115-2Y-01 / 2175-23-01 / 2175-24-01 / 2175-25-01 / 2175-26-01 / 2175-27-01 / 2175-2J-01 / 2175-2X-01 / 2175-2Y-01

Metrobility T3/E3 Models T3 Copper to T3 Fiber: 2115-23-01 T3 BNC to T3 multimode SC 2115-24-01 T3 BNC to T3 singlemode SC 2115-25-01 T3 BNC to T3 multimode ST 2115-26-01 T3 BNC to T3 singlemode ST 2115-27-01 T3 BNC to T3 singlemode SC (40km) 2115-2J-01 T3 BNC to T3 singlemode SC (100km) 2115-2X-01 T3 BNC to T3 singlemode SC 1550/1310nm bidirectional wavelength division multiplexed (BWDM) 2115-2Y-01 T3 BNC to T3 singlemode SC 1310/1550nm BWDM E3 Copper to E3 Fiber: 2175-23-01 E3 BNC to E3 multimode SC 2175-24-01 E3 BNC to E3 singlemode SC 2175-25-01 E3 BNC to E3 multimode ST 2175-26-01 E3 BNC to E3 singlemode ST 2175-27-01 E3 BNC to E3 singlemode SC (40km) 2175-2J-01 E3 BNC to E3 singlemode SC (100km) 2175-2X-01 E3 BNC to E3 singlemode SC 1550/1310nm BWDM 2175-2Y-01 E3 BNC to E3 singlemode SC 1310/1550nm BWDM This publication is protected by the copyright laws of the ed States and other countries, with all rights reserved. No part of this publication may be reproduced, stored in a retrieval system, translated, transcribed, or transmitted, in any form, or by any means manual, electric, electronic, electromagnetic, mechanical, chemical, optical or otherwise, without prior explicit written permission of Telco Systems, Inc. 2006 Telco Systems, Inc. All rights reserved. Printed in USA.

Table of Contents Metrobility T3/E3 twister Installation & User Guide Overview... 4 Installation Guide... 5 STEP 1: Unpack the Media Converter and Accessories... 5 STEP 2: Choose an Appropriate Location... 5 STEP 3: Set the Switches... 6 STEP 4: Connect to the Network... 7 STEP 5: Apply Power... 8 User Guide... 11 LED Indicators... 11 Theory of Operation... 12 Link Loss Indications... 14 Loopback Modes... 16 Topology Solutions... 18 Technical Specifications... 19 Acronyms and Abbreviations... 21 Product Safety, EMC and Compliance Statements... 22 Warranty and Servicing... 23 Metrobility, Metrobility Optical Systems, and twister are registered tradmarks and the Metrobility Optical Systems logo is a trademark of Telco Systems, a BATM company. All others are trademarks of their respective owners. The information contained in this document is assumed to be correct and current. The manufacturer is not responsible for errors or omissions and reserves the right to change specifications at any time without notice.

Overview Thank you for choosing the Metrobility T3/E3 media converter. The Metrobility T3/E3 media converter from Systems provides high-speed integration and conversion of T3 (44.736Mpbs) or E3 (34.368Mbps) coaxial telco communication lines to fiber transport environments. The copper data stream is converted to optical signals for greater noise immunity and longer transmission. The T3/E3 model supports remote fiber optic links up to 2km over multimode and up to 100km over singlemode cable. To optimize your T3/E3 network, this plug-and-play media converter operates seamlessly with low jitter. All signal activity is completely converted ensuring accurate communication within connected segments. The Metrobility T3 model features a user-selectable line build out, and all T3 and E3 models include independent copper and fiber loopback modes to isolate problems within a specific segment of the network. The Metrobility T3/E3 media converter offers the following key features: B3ZS (T3) or HDB3 (E3) line code support on the coaxial interface. System and port LEDs on the front panel for easy visual diagnostics. Independent copper and fiber loopback modes. User-selectable line build out for short or long haul operation on the T3 models. ial to multimode conversion up to 2km, coaxial to singlemode conversion up to 100km, or coaxial to bidirectional wavelength division multiplexed (BWDM) conversion up to 20km. Surge protection on the RX and TX ports of the coaxial interface. Low jitter for maximum transmission quality. Independent clocking on the RX and TX ports. High MTBF. 4 Overview

Installation Guide Follow the simple steps outlined in this section to install and start using your Metrobility T3/E3 media converter. 1 Unpack the Media Converter and Accessories Check that the following components have been included with your order: Metrobility T3/E3 media converter Power supply Power supply cord Four (4) rubber feet Your order has been provided with the safest possible packaging, but shipping damage does occasionally occur. Inspect your order carefully. If you discover any shipping damage, notify your carrier and follow their instructions for damage and claims. Save the original shipping carton if return or storage of the unit is necessary. 2 Choose an Appropriate Location The Metrobility T3/E3 media converter is intended for use in either office or industrial environments. The unit must be located within six (6) feet of the AC power source being used and placed as far away as possible from electrical noise generating equipment such as copiers, electrostatic printers and other motorized equipment. If exposed twisted-pair wiring is used nearby, the wiring should be routed as far away as possible from power cords and data cables to minimize interference. The unit may be oriented in any manner which permits the user to make physical connection to the power supply and leaves a minimum of six (6) inches of space for proper ventilation. TUV Compliance Note: For pluggable equipment, the socket outlet must be installed near the equipment and be easily accessible. Bei Geräten mit Steckanschluß muß die Steckdose nahe dem Gerät angebracht und leicht zugänglich sein. Metrobility T3/E3 5

3Set the Switches A set of DIP switches is located on the back of the unit. On the T3 models, functional switches are clearly labeled and allow you to select from several modes of operation. On the E3 models, only the switches labeled CLP and FLP are functional. Unmarked switches are inoperative. NOTE: The switch is ON when it is in the DOWN position. The switch is OFF when it is in the UP position. LBO Switch (functional only on T3 models) Set the Line Build Out (LBO) switch down to support a long haul connection if the length of your coaxial cable is between 255 and 1200 feet. Set LBO up to support a short haul connection if the length of your coaxial cable is less than 255 feet. The default setting is short haul. CLP Switch The Copper Loopback (CLP) switch enables/disables loopback on the copper port. When copper loopback is enabled, the incoming data and clock are looped from the RX copper port to the TX copper port, thus returning the copper input back to the sending device. At the same time, the data is transmitted to the remote T3/E3 unit. However, data from the remote unit is ignored. Loopback is disabled by default. For more information, refer to Loopback Modes in the User Guide section of this manual. FLP Switch The Fiber Loopback (FLP) switch enables/disables loopback on the fiber optic port. When fiber loopback is enabled, the incoming data and clock are looped from the RX fiber port to the TX fiber port. The data is also transmitted to the copper port, however, data from the copper port is ignored. Loopback is disabled by default. For more information, refer to Loopback Modes in the User Guide section of this manual. 6 Installation Guide

4 Connect to the Network The Metrobility T3/E3 model offers the ease of plug-and-play installation. Once power is applied to the unit, correct connectivity can be verified via the link () LED. To connect to the network, insert the cables into the appropriate connectors as illustrated below. When making network connections, make sure that the receive (RX) port on the unit connects to the transmit (TX) port of the connected device, and make sure that the receive port of the connected device connects to the transmit port of the Metrobility model. T3-FX SM twister 2115 T3-TX RX TX LBK RX LBK PWR E3-FX SM twister 2175 E3-TX RX TX TX RX LBK MAN PWR Metrobility T3/E3 7

ial Interface The coaxial interface provides two BNC connectors. The receive port is labeled RX and the transmit port is labeled TX. Each connector supports a maximum segment length of 1200 feet. Use only RG-59 cables. Fiber Optic Interface 2115-23-01, 2115-25-01, 2175-23-01 and 2175-25-01: The fiber optic multimode (MM) interface supports a maximum segment length of 2km for remote links. 2115-24-01, 2115-26-01, 2175-24-01 and 2175-26-01: The singlemode (SM) connector supports a maximum segment length of 15km. 2115-27-01 and 2175-27-01: The singlemode long haul interface supports a maximum segment of 40km. 2115-2J-01 and 2175-2J-01: The singlemode extended long haul interface supports a maximum segment length of 100km. BWDM Interface The 2115-2X-01, 2115-2Y-01, 2175-2X-01 and 2175-2Y-01 provide one bidirectional wavelength division multiplexed (BWDM) SC connector which supports a maximum segment length of up to 20km for remote links. BWDM units must always be used in complementary pairs. That is, a-2x model must be connected to a -2Y. The -2X unit is designed to transmit data at a wavelength of 1550nm and receive at 1310nm. Correspondingly, the -2Y unit transmits data at 1310nm and receives at 1550nm. up to 20km Metrobility -2X Model Metrobility -2Y Model 8 Installation Guide

LBO CLP FLP 5Apply Power Power is provided through the desktop power supply module. This power module is equipped with an S760 hollow-type plug for insertion into the DC jack located on the back of the unit and a standard IEC 320-type AC power receptacle. When making power connections, it is recommended that the DC power cord be connected to the DC input jack located on the back of the media converter before making the AC connection to the outlet. OFF ON PWR DC INPUT/5VDC Upon receiving power, the media converter goes into normal operation mode and automatically provides the appropriate signal translation between the connected network segments. Verify correct segment connectivity via the LEDs on the front panel. If an additional extension cord is used to connect the power module to the power source, the following guidelines must be followed. While one end of the AC power cord can be fitted with whatever plug is standard for the country of operation, the end that connects to the power supply module must have a female plug that fits this type of AC receptacle. Metrobility T3/E3 9

AC 115V (North American): use a UL-listed and CSA-certified cord set consisting of a minimum 18 AWG, type SVT or SJT three-conductor cord, a maximum of 15 feet in length and a parallel blade, grounding-type attachment plug rated 15A, 125V. AC 230V (USA): use a UL-listed cord set consisting of a minimum No. 18 AWG, type SVT three-conductor cord, a maximum of 15 feet in length and a Tandem blade grounding-type attachment plug rated 15A, 250V. 240V (outside USA): use a cord set consisting of a minimum No. 18 AWG cord and grounding-type attachment plug rated 15A, 250V. The cord set should have the appropriate safety approvals for the country in which the unit is being installed and marked HAR. 10 Installation Guide

User Guide This section contains more detailed information regarding the operating features of the Metrobility T3/E3 media converter. LED Indicators The Metrobility T3/E3 media converter provides several LEDs on the front panel for the visible verification of unit status and proper functionality. These LEDs can aid in troubleshooting and overall network diagnosis and management. System LED LED Label Color/ Status Indication PWR G reen is receiving power. O FF is not receiving power or has failed. Copper Port LEDs LED Label Color/ Status Indication G reen A signal is present on the copper receive port. O FF No signal is detected at the port. LBK Yellow Copper port is in loopback mode. Incoming frames on the copper port are sent back on the coaxial transmit line. Data is also sent through the fiber optic transmit line. O FF Loopback is disabled on the copper port; normal operation. Fiber Optic Port LEDs LED Label Color/ Status Indication G reen An optical signal is present on the fiber optic receive port. O FF No signal is detected at the fiber port. LBK Yellow Fiber port is in loopback mode. Incoming data and clock are sent back on the transmit fiber line. Data is also transmitted out the coaxial transmit line. O FF Loopback is disabled on the fiber port; normal operation. Metrobility T3/E3 11

Theory of Operation Functional Block Diagram RX ial TX Line Interface FPGA VCXO Fiber Optic Circuit TX Fiber RX Line Transformers ial to Fiber Data Path The receive (RX) port on the coaxial interface accepts an electrical signal. This signal is coupled to the line interface unit (LIU) through a line transformer. The LIU performs clock and data recovery and converts the signal into non-return to zero (NRZ) data and clock. The NRZ data and clock then pass through the field-programmable gate array (FPGA), which encodes the data for fiber optic transmission. The encoding ensures adequate transition density for reliable clock recovery at the remote T3/E3 fiber optic interface. Fiber to ial Data Path The RX port on the fiber interface accepts an optical signal from the remote T3/E3 unit and converts it back to an electrical signal. The optical signal first enters the voltage-controlled crystal oscillator (VCXO), which extracts the line rate clock and data. The recovered clock and data are then sent to the FPGA for decoding. The decoded data stream goes to the LIU for encoding into T3 or E3 signals. The transmitted signal is coupled to the BNC coaxial connector through a line transformer. On both the RX and TX ports of the coaxial interface, surge protection is provided. Timing Paths The transmit (TX) and receive (RX) paths are clocked independently and during normal operation, the Metrobility T3/E3 units are never timing masters of the network system. In the coaxial to fiber path, timing is recovered by the unitʼs LIU and transmitted over the fiber line to the remote T3/E3 unit. In the fiber to coaxial path, timing is derived from the incoming optical signal and sent over the coaxial TX line. 12 Installation Guide

A ial Local T3/E3 B Fiber Remote T3/E3 C ial F E D The following table describes how timing is affected if a failure occurs at various points in the network. Line Failure Point A B C D E F Result The local T3/E3 unit detects loss of signal. The fiber receiver's VCXO becomes the timing source for transmission over fiber link B. The remote T3/E3 unit's VCXO reverts to its reference remote T3/E3 unit becomes the system timing master. clock input. The If the equipment connected to the remote T3/E3 unit supports looped timing, the equipment should revert to its internal clock when it detects loss of signal. Alternatively, the equipment could fail to provide a valid signal or clock, and the system will behave as if the failure occurred at point D. The remote T3/E3 unit's LIU detects loss of signal. The fiber receiver's VCXO becomes the timing source for transmission over fiber link E. The local T3/E3 unit's VCXO reverts to its reference T3/E3 unit becomes the system timing master. No system timing disruption unit detects loss of signal. clock input. The local occurs. The device connected to the local T3/E3 Data Transparency The Metrobility T3/E3 media converter offers full data transparency. Any codes or commands contained within the data stream are passed through to the remote device. The only commands executed by the Metrobility converter are those set through the Metrobility T3/E3 13

Link Loss Indications The following examples show the status of the LED under various link conditions and describe when unframed all ones are generated. (Loopback is disabled in these examples.) Note: An all-ones pattern indicates an alarm indication signal (AIS) for the E3 units only. For T3 models, the all-ones pattern is simply transmitted to the remote device; it does NOT indicate AIS. Normal The diagram below shows a typical configuration with good link status. Local Local T3/E3 Fiber Remote T3/E3 Remote green LED unlit LED Input ial Link Loss Loss of the copper input disables the BNC portʼs LED. It also forces the T3/E3 unit to generate unframed all ones (AIS for E3 only), which are transmitted out its fiber port. For example, if the local unitʼs inbound coaxial cable breaks, it will transmit all ones to the remote T3/E3 unit via the fiber cable. The remote unit then carries the pattern forward via its coaxial cable to the remote device. Local Local T3/E3 All Ones Fiber Remote T3/E3 All Ones Remote All Ones carried forward green LED unlit LED Input Fiber Link Loss Loss of the fiber input is indicated by the fiber portʼs unlit LED. When the fiber input is lost, an unframed all-ones pattern is transmitted from the coaxial port, as shown in the following illustration. 14 User Guide

Local Local T3/E3 Remote T3/E3 Remote All Ones Fiber green LED unlit LED Remote ial Link Loss Loss of link to the remote device produces a red alarm condition at the remote site and should force the device to revert to its internal clock. If the remote device is configured to send back a yellow alarm under this condition, the two T3/E3 units will carry the alarm forward to the local device, as shown below. Local Local T3/E3 Remote T3/E3 Remote AIS Fiber AIS AIS AIS carried forward green LED unlit LED Metrobility T3/E3 15

Loopback Modes The Metrobility T3/E3 media converter features two loopback modes to help verify correct installation and to diagnose system problems. Normal During normal operation, without loopback, data from a local device (CSU, PBX, etc.) enters the local T3/E3 unitʼs coaxial receiver, passes through the fiber line between the two converters, then exits the remote unitʼs coaxial transmitter to enter the remote equipment, and vice versa. Local Local T3/E3 Remote T3/E3 Remote Fiber Loopback Loopback helps to isolate and identify traffic problems within a specific segment. During loopback, the yellow LBK LED is lit. Loopback is enabled/disabled by setting DIP switch 2 or 3. Once loopback is enabled, the unit will remain in this mode until the DIP switch is turned off. Copper and fiber loopback cannot be enabled at the same time. If both DIP switches are enabled, only the first one set will be in effect until it is disabled. Copper Loopback During copper loopback, timing and data received on the coaxial line are looped back to the sending device. The loop occurs in the FPGA. The data is also transmitted to the remote T3/E3 converter, but the data from the remote unit is ignored by the converter in loopback mode. In the example shown below, the local T3/E3 unit has copper loopback enabled. Data received at the BNC port is simultaneously returned to the local device and sent to the remote T3/E3 unit and on to the remote device. Data from the remote device is transmitted by the remote unit, however, it is ignored by the local unit at its fiber optic interface. Local Local T3/E3 with Copper Loopback Remote T3/E3 Remote X Fiber 16 User Guide

Fiber Loopback In this mode, the incoming data and clock on the fiber line are looped back. The loop occurs in the FPGA. The data is still sent out the coaxial transmitter. However, the data received at the BNC interface is ignored. In the example below, the remote T3/E3 unit has fiber loopback enabled. Data received at the fiber optic input is simultaneously returned to the local device and sent to the remote device. However, data from the remote device is ignored by the remote T3/E3 unit at its coaxial interface. Local Local T3/E3 Remote T3/E3 with Fiber Loopback Remote Fiber X Metrobility T3/E3 17

Topology Solutions The Metrobility T3/E3 model is a point-to-point media converter designed to extend the reach of copper T3/E3 links and to provide protection from power surges and electromagnetic interference. Each model supports a single remote T3/E3 unit. Private Branch Exchange (PBX) PBX up to 100km singlemode Metrobility T3/E3 Model Metrobility T3/E3 Model copper T3/E3 fiber T3/E3 Data Service (DSU) Channel Service (CSU) Metrobility T3/E3 Model up to 100km singlemode Metrobility T3/E3 Model PBX CSU Metrobility R5000 Chassis with T3/E3 Modules up to 2km multimode Metrobility T3/E3 Model 18 User Guide

Technical Specifications Network Connections ial Interface Connector BNC receptacle Impedance 75 ohms Signal Structure ANSI T1.404, T1404a (T3) ITU G.703 (E3) Supported Link Length up to 1200 ft Cable Type RG-59 coaxial cable Multimode Fiber Optic Interface Connector ST or SC Wavelength 1310 nm RX Input Sensitivity -31 dbm peak minimum Output Power -20 dbm to -14 dbm (62.5/125 µm) Supported Link Length up to 2km full duplex Cable Type 50/125, 62.5/125 µm F/O Singlemode Fiber Optic Interface Connector ST or SC Wavelength 1310 nm RX Input Sensitivity -31 dbm peak minimum Output Power -15 dbm to -8 dbm (9/125 µm) Supported Link Length up to 15km full duplex Cable Type 8.3/125, 8.7/125, 9/125, 10/125 µm F/O Singlemode Fiber Optic Interface long haul distance support Connector SC Wavelength 1310 nm RX Input Sensitivity -35 dbm minimum Output Power -5 dbm to 0 dbm (9/125 µm) Supported Link Length up to 40km full duplex Cable Type 8.3/125, 8.7/125, 9/125, 10/125 µm F/O Metrobility T3/E3 19

Singlemode Fiber Optic Interface extended long haul distance support Connector SC Wavelength 1550 nm RX Input Sensitivity -37 dbm minimum Output Power -3.0 dbm to 0 dbm (9/125 µm) Supported Link Length up to 100km full duplex Cable Type 8.3/125, 8.7/125, 9/125, 10/125 µm F/O Singlemode BWDM Fiber Optic Interface Connector SC Supported Link Length up to 20km full duplex Cable Type 9/125 µm F/O (2115-2X-01, 2175-2X-01) TX Wavelength 1550nm RX Wavelength 1310nm RX Input Sensitivity -32 dbm minimum Output Power -8 dbm to -15 dbm (9/125 µm) (2115-2Y-01, 2175-2Y-01) TX Wavelength 1310nm RX Wavelength 1550nm RX Input Sensitivity -32 dbm minimum Output Power -8 dbm to -15 dbm (9/125 µm) Data Rate Data Rate 44.736Mbps (T3); 34.368Mbps (E3) Power Input +5.0VDC @ 0.4A, 2W average Environmental Operating Temperature 0 to 55 C Storage Temperature -30 to 70 C Relative Humidity 5% to 95% non-condensing Physical Case Fully enclosed metal construction Dimensions 4.38"L x 3.26"W x 1.71"H 12.3 cm x 8.3 cm x 4.3 cm Weight (including power supply) 3 lb, 1.36 kg 20 User Guide

Acronyms and Abbreviations This list defines the acronyms and abbreviations used in this guide. AIS Alarm Indication Signal ANSI American National Standards Institute AWG American Wire Gauge B3ZS Bipolar Three Zeroes Substitution T3 line coding BNC Bayonet-Neill-Concelman connector BWDM Bidirectional Wavelength Division Multiplexed CLP Copper Loopback CSA Canadian Standards Association CSU Channel Service DSU Data Service E3 34.368 Mbps communications standard F/O Fiber Optic FLP Fiber Loopback FPGA Field-Programmable Gate Array HDB3 High Density Bipolar Three Zeroes Substitution E3 line coding IEC International Electrotechnical Commission ITU International Telecommunications Union LBK Loopback LBO Line Build Out LIU Line Interface Link Mbps Megabits per second MM Multimode MTBF Mean Time Between Failures NRZ Non-Return to Zero line coding PBX Private Branch Exchange PWR Power RX Receive SM Singlemode T3 44.736 Mbps communications standard TX Transmit UL Underwriters Laboratories VCXO Voltage-controlled crystal oscillator Metrobility T3/E3 21

Product Safety, EMC and Compliance Statements This equipment complies with the following requirements: UL ITU-G.703 CSA G.704 EN60950 (safety) G.706 FCC Part 15, Class A ANSI T1.403-1999 EN55022 Class A (emissions) ANSI T1.408 EN55024: 1998 (immunity) Class 1 Laser Product IEC 825-1 Classification ICES-003 Class A (emissions) CB This product shall be handled, stored and disposed of in accordance with all governing and applicable safety and environmental regulatory agency requirements. The following FCC and Industry Canada compliance information is applicable to North American customers only. USA FCC Radio Frequency Interference Statement This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses and can radiate radio frequency energy, and if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense. Caution: Changes or modifications to this equipment not expressly approved by the party responsible for compliance could void the userʼs authority to operate the equipment. Canadian Radio Frequency Interference Statement This Class A digital apparatus meets all requirements of the Canadian Interference- Causing Equipment Regulations. Cet appareil numérique de la classe A respecte toutes les exigences du Réglement sur le matériel brouilleur du Canada. 22 User Guide

Warranty and Servicing Telco Systems Product Warranty TELCO MAKES NO WARRANTIES EXCEPT AS HEREIN SET FORTH: Telco warrants that the equipment and accessories manufactured by Telco, when used in the application and manner for which they are intended, will be free from defects caused by faulty material or poor workmanship from the date of shipment. This warranty is subject to change at any time. The warranty that applies is that which is in effect at the time the equipment ships. Warranty period is specific to particular product offerings. These periods are as follows: Metrobility Products- 1 year IP and EdgeGate Products 1 year Telco s liability under this warranty is limited to, the obligation, at Telco s sole option, to repair or, to replace at Telco s plant at Massachusetts, any part found to be defective under normal use and service within the warranty period specified herein, provided: a) Telco is promptly notified in writing upon discovery of such defects; b) The defective parts are returned to Telco, transportation charges prepaid in accordance with Telco s instructions; c) Telco s examination shall disclose to its satisfaction that such defects have not been caused by misuse, abuse, neglect, accident, or adjustments other than those specified in the Telco Operating and Maintenance Manual. Telco shall have no responsibility under this warranty for defects, which have been caused by misuse, abuse, improper application, repair, alteration, accident or negligence in use, storage, transportation or handling. Further, the original identification markings must not have been removed, defaced or altered. d) Equipment has been installed and operated, and maintained, in complete accordance with the Telco Operating and Maintenance Manual, and good engineering practice. Though component parts of Telco-manufactured goods are covered by the above warranty, TELCO MAKES NO WAR- RANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE NOR ANY OTHER WARRANTY, EXPRESS OR IMPLIED, FOR ANY EQUIPMENT OR MERCHANDISE NOT MANUFACTURED BY TELCO (FOR EXAMPLE BUT WITHOUT LIMITATION, ACCESSORIES AND AUXILIARY ITEMS). However, Telco will cooperate reasonably with Purchaser in attempting to secure, where possible, the benefit of any warranties which the manufacturer of such non-telco items may provide. All ordered replacement parts or parts replaced during the warranty period assume the unexpired portion of the original parts warranty or ninety (90) days from date of shipment, whichever is longer. Replacement, Repair or Refund Procedure for Hardware: Telco s sole obligation under this express warranty shall be, at Telco s option and expense, to repair the defective product or part or deliver to Customer an equivalent product or part to replace the defective item. All products that are replaced will become the property of Telco Systems. Replacement products or parts may be new or reconditioned. Telco warrants any replaced or repaired product or part for ninety (90) days from shipment, or the remainder of the initial warranty period, whichever is longer. Telco reserves the right to refund the purchase price paid for the defective product as its exclusive warranty remedy. To Receive a Return Materials Authorization (RMA) Number: Please contact the party from whom you purchased the product. If you purchased the product directly from Telco Systems, contact the Telco Systems Customer Care Group. Software: Telco warrants to Customer that each software program licensed from it will, if operated as directed in the user documentation, substantially achieve the functionality described in the user documentation for a period of ninety (90) days from the date of purchase from Telco or its authorized reseller. No updates or upgrades are provided under this warranty. Telco s sole obligation under this express warranty shall be, at Telco s option and expense, to refund the purchase price for the software product or replace the software product with software which meets the requirements of this warranty as described above. Customer assumes responsibility for the selection of the appropriate programs and associated reference materials. Telco expressly disclaims any warranty or representation that its software products will meet Customer s requirements or work in combination with any hardware or software products provided by third parties, that the operation of the software products will be uninterrupted or error free, or that all defects in the software products will be corrected. The foregoing warranties are in lieu of any and all other warranties, expressed or implied, including, but not limited to, warranties of merchantability, fitness for a particular purpose or against infringement of any rights of third parties. Telco s liability on any claim for money damages (including, without limitation negligence for any loss or damage arising out of, connected with, or resulting from the sale of products hereunder, or from the performance or breach thereof, or from the design, manufacture, sale, delivery, resale, installation, inspection, repair, operation or use of any merchandise manufactured by Telco) shall in no case exceed the price allocable to the merchandise or part thereof which gave rise to the claim. Purchaser will hold Telco harmless with respect to any claims or actions by third parties. In particular, Telco expressly disclaims and shall in no event be liable for any indirect, special, incidental or consequential damages. Metrobility T3/E3 23

US Headquarters 2 Hampshire Street Suite 3A Foxboro MA USA 02035 tel: 1.781.551.0300 fax: 1.781.255.2344 www.telco.com Int'l Headquarters Germany Asia Pacific France tel: +972.9.866.2525 tel: +49 (0) 5331.8824.0 tel: (65) 6722.529901 tel: +33 (0) 1,567.12.773 5660-000042 E 12/06